This is a basic "home made" Op-Amp as described by Youtuber "IMSAI Guy". Additional components and switches have been added to re-create the scenarios: unity gain buffer, comparator, inverting and non-inverting amplifiers, and peak detector. You will need to work out which switches to open and close for each scenario. If you get the "Cannot find solution" error then just open up the switches on the right connecting both of the 12v power supplies, restart the circuit and then re-close the switches.
